I am wondering what kind of pressure the savage 212 can handle and if i can mod the bolt to work with 50bmg brass. I have taken some of my 700WTF brass and trimed it to 2.25" long and necked it to take a .620 bullet. I think if the action is as strong as i hope i can get 2000-2300 fps with a 900gr bullet and still have it mag feed with the factory mag. below is some pictures of the 620 ROF case i have designed. I have been working on a full length version at 3.900". Im wondering what kind of pressure i can put to the savage 212 right out of the box and what i can do to inprove it if needed.

Ed hublel might help me out here but The savage 220 20 gauge slug gun might be a better platform.
Reduce the rims to .775" to fit the 20 gauge rim
Make some .615" bullets and keep the pressure under 30k psi but I'm not sure about if there is enough action and barrel metal around the base.
You could rebarrel to 620 if desired.
I like the idea of just cutting the 50 bmg brass to 2.25" at that length you could use 12 gauge reloading dies and work in the savage 12 gauge magazine. You could add a rim like the 12gfh.

Why not just use a McMillan action and go to a FL .50 BMG based .600? That's what I did with the .600 RLG. That way you can go to 65KPSI and not worry. That thing worked great! I would not push any bolt action shotgun action over 30-35 KPSi without using a string to fire it. Then, I'd re- dimension everything. That's really uncharted territory. I agree that a .600 / rimmed 12gaFH case might be pretty cool.There also was a guy years ago who did a .50 BMG cased short .600 on a M98 action as I remember. It held only two rounds though. He re- heat treated it too. Isn't that case similar to what Foobar is working on? Me , I'm working on a 12gafh 3.5 inch with a 900 gr .600 sabot for the Benneli Nova pump gun which should do 1850 fps with 900 gr bullets. Aiming for 18-19 KPSi max. -Rob

I had thought about just making a 12ga from hell MINI and maybe that's the the thing that would be best.

JT- Ill give you my programs for the rims and threading the cases if you want them.Even have one for engraving the rims. My machines are Haas but you could just mod the G- code for your machines. I always thought a rimmed 12gafh case necked to .45, .50 and .600 would be a neat way to utilize 12ga actions for stomper calibers.-Rob

sweet, thanks rob. the reasion I was looking at the 212 was because it was cheep. but maybe a full length 12 from hell necked to 620 with a rim would be the ticket in the strong actions.

JT -Depending on what machines you have I could just change the post processor on my Cam software and out-put the code secifically for your gear. They are not complicated Pgm's anyway.
No one has ever done a 12 ga rimmed/.600 to my knowledge and being able to use strong .BMG brass and reliable .50 BMG primers always was a big factor to my thinking. I would bet you would easily be able to get well over 2200fps from a savage 212 with a .600 barrel on it. -Rob

rob in my cell "private workstation" I run a Romi lathe and a hass mill. the lathe is nothing fancy but its perfect for the jobs I do. I do a lot of one off parts so its great. also I program it in conversational so its very fast, it runs g code as well but I don't use it. I have been wanting to play with converting shotguns to rifles and would really like to play with a double. man a nice side by side in a necked 12ga from hell would be sick.

A few pages back on the 12gfh thread Ed made some dummies of the 12gfh short using bmg brass.
A 12/20 gauge sounds like fun. Maybe just a simple neck up of 50 BMG with a rim.
Since you are a machinist maybe you could scale up a lever action and shoot 12 gauge from hell shorts at 40k psi. Think of the 1887 lever action shotgun but stronger.

I love that case.
It looks like a short mag on a LOT of steroids.

Cheers, John

It would open up lots of doors if you could adapt the Savage bolt to fit the smaller rim.

Wouldn't it be better to modify the Savage 220 bolt to accept the BMG rim?
Easier, Cheaper, Faster in the long run???

Custom brass that is cheap and easy to replace is a beautiful thing.

Cheers, John

I used a savage 220 action. Necked 20ga brass cases to 50BMG and have load data for subsonic suppressed fun. I also have the reamer.

quote:

Originally posted by Phatman:
Wouldn't it be better to modify the Savage 220 bolt to accept the BMG rim?
Easier, Cheaper, Faster in the long run???

The 220 is a much smaller action.

The 220 is interesting in that it's a shotgun but in a strong bolt action designed for high pressure carts. The 220 could be a great candidate for a 600 OK short.

the 220 is just a 110 action i beleve so as it might be ok for med-hot 20ga rounds enough material has been removed that i would be worried about punching it up any more then hot 20ga loads.

quote:

Originally posted by JTknives:
the 220 is just a 110 action i beleve so as it might be ok for med-hot 20ga rounds enough material has been removed that i would be worried about punching it up any more then hot 20ga loads.

Exactly. The 212 receiver is 1.50" in diameter with a .90" bolt vs. the 220's 1.35" and .70".

So long at it could be make to work, I'd rather have the 212.

JT,

What is the case capacity of your 620?

So if the 212 is stronger maybe the smaller 20 gauge on that action would be a better idea.

if you think about it the 20ga and 12 ga if loaded to the same pressure then the 12ga will have much more bolt thrust. so maybe a 600 OK in the savage 212 might be ok

OK, question
What action did Savage build thier 338 Lapua on???

Cheers, John

It would actually take a fair amount of work to modify a 12ga boldface to take a .50 BMG rim. You also will need to change the extractor and ejector in most cases. Way easier to stick with the rimmed case.-Rob

THe one I built on the 220 action is the one on the far left .50RDB

USE 212 for bmg/12ga size cases.
Its OD is 1.5" so big barrels fit up, look good.
Letting the extractors close in is done by changing
extractor slots, and with your machines you can make any
bolt head if needed, as it is fit in front of the bolt.
I closed extractors down to bmg and 16ga size.
The 212 2 lug bolt has thrust rating of 36,000 lbs-
the 210 had 39,000 with 3 smaller lugs. Run 32,000 psi
loads in bmg/12ga size cases, about 12,000 bolt thrust,
which is about 3 to 1 bolt thrust safety factor that most in
the industry like to have. The 212 bolt is like rifle 110s, a
conventional bolt setup so a third rear lug can be
added so that 50,000 psi loads can be used if you want,
but my work with a 210 shows that you can do very
well with 32-34,000 psi loads.Ed

so if i was going to do a 620 ROF would it be better to use the 212 or the 210. is the acaton body on the 210 the same diamater as the 1.5 on the 212?

No the 210 smaller at 1.35" and had a 3 lug bolt head.
It was a weak link I felt in trying to go to top ;
loads. I had wanted to make a big diameter action
to put the 3 lug bolt into, but then they came
out with 212. So the 212 is best because you can
set it up with extra lugs and be super strong.Ed

So what weapon would you modify to use the 620ROF just as you see it in the pics????
No adding rims
No RMC brass

I'm having fond little dreams of doing s Saiga shotgun in something like this someday. Wishful thinking

Cheers, John

Im going to use the savage 212 and fit it up with a 3rd rear lug so i can push the loadings a bit.

The basic dilemma is that all these shotgun actions run out of steam at 30KPSI or so. This includes the savage Bolt actions and the NEF SS. Remember even in the FL 4" 12GaFH case the best the NEF would do is 1800 fps with a 1000 gr bullet. You still need a .620 rifled barrel too. By the time you spend the money on the action and gunsmithing your at or above the cost of a CZ550 action which will go 65 KPSI and is track proven combo. Using these shotgun actions really makes little or no sense other than the fun of doing something different. Remember all these over .510 cartridges still need to be BATFE registered too!!! Bad Karma without Registration! Thats the very reason the 12GaFH was developed in the first place!!!!!. No requirement to register any shotgun based round.
To me the allure of the 12Ga action is in launching thee biggest possible bullets, and no registration required. I'm betting the 12 GaFH 3.5 inch with 900 gr sabots at 22KPSI will duplicate the old .600NE load and still be manageable( if it isn't I'll just add weight) and I don't need to register it!. Accuracy wise, the equal of any big bore double rifle at the same hunting ranges. I'm going to pressure test the 3.5 inch sabot load in the 12GaFH 4" NEF that I have using a Oehler strain guage and if it works, then try it in a Benneli NOVA 3.5 inch. That and fast multiple shot capability is all I'll ever need out of a shotgun!-Rob